- a cardinal number represented in the U.S. by 1 followed by 63 zeros, and in Great Britain by 1 followed by 120 zeros.
- amounting to one vigintillion in number.
Origin of vigintillion
1900–05; < Latin vīgint(ī) twenty + -illion, as in million
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018